Sand-blasting screen



Jan. 29 1924.

L. H. CARUFEL SAND' BLASTING SCREEN Filed July 24, 1922 gwupntoz L. H. llar'uf e'L I Patented den. 29, 1924.

Louis H. c anogen, or BISMARCK, NORTH DAKOTA.

seivn-reniis'rme' SCREEN.

Application filed July 24,

To all whom it may concern:

Be it known that 1, Louis H. CARUFEL, a citizen of the United States, residing Bismarck, in the county of Burleigh and State of North Dakota, have invented cer tain new and useful Improvements in Sand- Blasting Screens, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to sand blasting screens, and has for its object to provide a screen of this character arranged to hold a number of stencils containing initials, letters, or other characters to be sand blasted on an object.

It is another object of the invention to provide a screen of this character adapted to hold a plurality of stencils, the stencils being positioned so that the face of the screen adjacent the stencils, and the stencils, may be'iirmly engaged with the object to be sandblasted, to prevent leakage of the sand blasting material beneath the frame or the stencils.

It is a further objectof the invention to provide a screen of this character wherein the opening in the screen is bridged by stencils secured in thes'creen and held in engagement with each other by means carried by the screen.

WVith these and other objects in View, the invention consists in the improved construction and arrangement of parts to be hereinafter more particularly described, fully claimed and illustrated in the accompany-- in drawings, in which 2- a Figure 1, is a bottom plan view of a sand blasting screen constructed in accordance with an embodiment of the invention;

Figure 2 is a section taken on the line 22 of Figure l; g

Figure 3 is a section taken on the line 33 of Figure 1;

Figure 4 is a perspective view of one of I the stencils, showing the brackets for holding the centerpieces of the stencils; and

F lgure 5 1s a fragmentary bottom plan view of another form of the lllVGDtlOIlQ The method previously used to sand blast blasted.

1922. Serial No. 577,253. r

I composition had" to be removed andthe surface of the object cleaned. All ofthis requires considerable time and great skill. l Vith the .present invention this disadvantage is overcome by the provision of a novel form of screen capable of being used indefinitely for sand blasting designs, letters, figures, characters, etc., without requiring the'application of a composition to the object to be sand blasted. The sand blasting operation may be started immediately upon application of a screen to the object or work. v

The device above referred to embodies a screen or frame 5 including side members 6 and 7 and end members 8 and 9, said members being relatively broad so as to provide a broad surfaceto protect the object on which the screen is used. This frame may be made of any desired material, The material, however, must be of a nature to pro: vent the passage of sand particles there through in the sand blasting operation.

The end and side members ofthe frame are made relatively thick, although not as thick as they are broad, so as to render the frame substantial. The end and side members cooperate to provide a frame having a central opening 10, an upper face 11, and a lower face 12. It is of course obvious that the end and side members may be made in various lengths to increase or decrease the size of the opening 10, according to the size of the stencils and the character to be sand The inner edge of the lower face 12 of each of the side members 6 and 7 is reduced to provide a groove 13, the distance between the wall 14 of each groove correspoi'iding to the length of a stencil, so that the grooves 13 cooperate to provide aguide. The end member 9 has the inner edge of its lowerface 12 reduced to provide a groove 15,. said groove registering with the end with a slot 18.

By the cooperation of the grooves 13, 15 and 16, a supplemental frame is substantially provided at the inner edge of the lower face 12 of the main frame. The purpose of the reduced edges is to permit the stencils to lie flush with the lower face 12 ofthe screen, and eliminate as far as possible all projecting parts or obstructions which would tend to raise the frame or stencils from the object to be sand blasted.

In connection with the frame 5, a plurality of stencils 19 are provided. Said stencils may be madeas wide as desired, but of a length corresponding to the distance between the recesses of the side members 6 and 7. The end por ions 20 and 21 of the stencils are intended to engage the bottoms of the grooves so as to bridge the opening- 10. The stencils'may be provided with any desired characters, such as initials, numbers, symbols, etc, the chaacters desired being cut out in such a manner to permit the passage of sand through the portions re moved. In the formationbf stencils hav ing centerpieces which are not connected to the remaining portions of the stencils, for instance. such as the letters 0, A, P, etc., the central portion 22 of the stencil not connected to any other portion of the stencil in theusual. manner, is positioned centrally of the cut away poi-tion by means of brackf reaching the portions of the stencil beneath the brackets. I

Disposed in the slot 18 of the groove 17 is a set screw 25, said set screw beingmovable longitudinally of the slot and having a head 26 adapted to engage the upper face 11 ofthe end portion 8 of the frame. The shank of the screw is threaded into a plate 27 which is disposed in the guides and grooves 17. This plate is intended to be moved longitudinally of the guides so as to urge the stencils into binding engagement with each other and with theopposite end portion of the frame to permit'the frame to be moved about without danger of the stencils falling from the frame. To prevent the passage of sand between the stencils in the sand blasting operation, the side portion 28 of each stencil is provided with a tongue, while the side portion 29 is provided with a groove, the tongue of one stencil being adapted to enter the groove of an ad acent stencil. In this 'way it is impossible for any sand to pass be tween the stencils so that there is no danger of marks not desired being blasted on the work. By the novel arrangement of the grooves 13,15 and 17 the lower faces of each stencil may be firmly engaged with the object to be sand blasted as well as the and arranget as desired. trough, mentioned above, it is possible Ior lower face 12 of the frame, so that it is impossible for any sand to pass beneath the stencil or the frame; At the same time, in View of the thickness of the end and side members of the frame, atrough is substantially providedintowhicli the sand is discharged and upon the stencils. in arranging the characters to be sand blasted, the frame is inverted, that is, the lower face is disposed uppermost so as to position the guides toward the operator. The stencils may then be placed within the opening 10 the brackets 23'to extend into said trough during arrangementof thescreen, without In View of the:

causing the stencils to be raised above the screen.

After the stencils have been arranged-as desired and the blank stencils applied to close the undesiredportion of the opening 10, the plate 27 is moved into engagement with the end-most stciicilsso as to force the remaining stencils toward the end portion 9 of the frame and the set screw tightened to lock the stencils in the frame. The frame may then be turned overto position the;

stencils on the object to be sand blasted. The

, frame is firmly clamped to the obj ect by any suitable means to prevent movement 'of theframe during the sand blasting operation;

lnFigure 5, another form of the inven tion is shown. This form consists in making the end members 8 and 9 relatively long and disposing bars 30 between the end members, each bar having the longitudinal edges of its lower face grooved similar to the side inembers6 and 7 A so that the space between each bar providesa separate frame for the recep-;

tion of the stencils, portionsof each of the end members between said bars being pro vided with set screws 31 similar to the end members 8. In this way any amount of let-1 tei'ing or figures maybe blasted on a pane of glass or li'ke, object. An important feature of this invention is that-the lower faceof the frame and the lower face of thestencils are" permitted to lie lush so that they can evenly engage the object to be sand blastedpand provide as tight a connection as thecompo sition previously used. V

From the foregoingit will be readily seen that this invention provides anovel form of said blasting screen, the novel arrangement of which permits the same to be used for the purpose of decorating glass, and particularly for the purpose of blasting names, ini tials, numbers, or characters on the windsh'ields or like glass parts of automobiles.

What is claimed is:

1. A sand blasting screen comprising a frame having an elongated opening therein, the edges of the opening being rabbetted, a plurality of stencils located within theopening and engaging upon said rabbets," a

clamping plate movably mounted Within the opening and seating upon the rabbets, and a screw threaded into said plate, the frame being provided with an elongated slot for the reception of said screw whereby said plate may be moved into clamping engagement with the stencils for holding the latter in engagement with one another and with the opposite end of the frame.

2. A sand blasting screen comprising a frame, the inner edges of said frame being grooved to provide guide means, stencil plates and stencil blanks having their ends disposed in the grooves and bridging the opening in the frame, and screw means carried by the frame for holding the stencils and blanks in engagement with each other and the frame. V

3. A sand blasting screen comprising a frame including end and side members, the inner edges of one face of each of the side and end members being reduced to substantially provide a supplemental frame, stencil plates and stencil blanks disposed in the supplemental frame and bridging the opening of the frame, said stencils being positioned flush with the lower face of the frame, an adjusting plate carried by the frame and bridging the opening thereof, and a set screw adjustably mounted in one of the end members of the frame and operatively connected to said plate for holding the stencils in binding engagement with each other and the frame.

4. A sand blasting screen comprising a frame including end and side members, the inner edges of one face of each of the side and end members being reduced to substantially provide a supplemental frame, stencil plates and stencil blanks disposed in the supplemental frame and bridging the opening of the frame, said stencils being positioned flush with the lower face of the frame, one side of each stencil being provided with a tongue, the opposite side of each stencil having a groove, the tongue of one stencil being adapted to extend into the groove of an adjacent stencil to render the stencils leak-proof, an adjusting plate slidable in the supplemental frame adjacent one end of the frame, said end of the frame having an elongated slot, and a set screw movable in said slot and mounted on the adjusting plate, said adjusting plate being adapted to hold the stencils 1n clamped ini terfitting engagement with one another and within the frame.

In testimony whereof I hereunto affix my signature.

' LOUIS H. GARUFEL. 

